Showing posts with label INTERCOM. Show all posts
Showing posts with label INTERCOM. Show all posts
Sunday, August 21, 2011
LM390 SIMPLE 2-WAY INTERCOM CIRCUIT SCHEMATIC DIAGRAM
LM390 SIMPLE 2-WAY INTERCOM CIRCUIT SCHEMATIC DIAGRAM
The LM390 Power Audio Amplifier is optimized for 6V, 7.5V, 9V operation into low impedance loads. The gain is internally set at 20 to keep the external part count low, but the addition of an external resistor and capacitor between pins 2 and 6 wil increase the gain to any value up to 200. The inputs are ground referenced while the output is automatically biased to one half the supply voltage.
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